On Sun, 5 Feb 2012, Juergen Daubert wrote:
> With version 8.21 the soname is libpcre.so.0.0.1 which means that everything
> that is linked with libpcre must be recompiled against the new version. I don't
> think that this is intended nor necessary.

I think it is, strictly, necessary. The function pcre_info(), which has
been obsolete for 10 years, was removed from the API. It did not seem
sensible to perpetuate the obsolescence by inventing a matching
pcre16_info(). Any program that still uses pcre_info() will fail with
8.30 and re-linking should show that up.
> If I understood the manual of libtool, see [1], correct we should set the
> version as follows:
>
> m4_define(libpcre_version, [1:0:1])
>
> With that setting the library version will be libpcre.so.0.2.0

I don't know much about these settings. The value
> m4_define(libpcre_version, [1:0:0])